Flumble wrote:Hasn't biology found a way yet to make species of insects/funghi that love one particular spikey invasive plant (in a not-so-symbiotic way)? Or any particularly invasive plant for that matter, because we're getting more and more of those due to all our world-wide transport.

Such insect/fungi would themselves be highly invasive if they ever reached the plant's native range, so then you need another insect/fungus specifically for curtailing the spread of the first one. Not sure if it'd actually go any layers deeper than that, though.